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Alliant Techsystems Takes Army Mortar Contract (Again)". Defense Industry Daily. Dec 7, 2004. Archived from the original on 2006-03-18 . Retrieved 2018-06-11. Operators may fire spin-stabilised rounds from either a smoothbore or a rifled barrel. Rifled mortars are more accurate but slower to load. Since mortars are generally muzzle-loaded, mortar bombs for rifled barrels usually have a pre-engraved band, called an obturator, that engages with the rifling of the barrel. Exceptions to this were the U.S. M2 4.2-inch mortar and M30 mortar, whose ammunition had a sub-calibre expandable ring that enlarged when fired. This allows the projectile to slide down the barrel freely but grip the rifling when fired. The system resembles the Minié ball for muzzle-loading rifles. For extra range, propellant rings (augmentation charges) are attached to the bomb's fins. The rings are usually easy to remove, because they have a major influence on the speed and thus the range of the bomb. Some mortar rounds can be fired without any augmentation charges, e.g., the 81 mm L16 mortar. As a general rule, however, Portland cement should not be used for the repair or repointing of older buildings built in lime mortar, which require the flexibility, softness and breathability of lime if they are to function correctly. [13] [14] Compared to long range artillery [ edit ] Self-propelled mortar based on K-4386 during the "Armiya 2020" exhibition

Colourants are applied to mortar to achieve a specific colour. Additives may be mixed with Portland cement among other mortar types.Mix together your required aggregates e.g. soft sand, sharp sand, lime (if chosen). Put sand heaped on spot board, hollow the centre and add cement (or lime) as required. Mix them thoroughly until all the same colour by folding from the outside in with your shovel lime mortar mix ratio. Lime mortar is a long-standing form of mortar that is primarily made from water and lime. For this section, we will look at the ideal mortar mix ratio for a chimney and what materials should be included in this mix. primary materials you will need. When it comes to new builds, you should also employ natural hydraulic lime which may need fine

Precision guided [ edit ] Soldiers standing in front of an M1064 mortar carrier, holding a XM395 Precision Guided Mortar Munition prototype at Fort Benning, Georgia, February 2006The quality of ready-mix mortar varies depending on the manufacturer but there are many popular products on the market which have Accelerators are used to speed up the hardening of cement. Accelerators can be used in any type of mortar although Visit us at Trade Shows like ForceCon 2022, LOA (LOA 2022 featured an entire MOTAR Zone!) and I/ITSEC! From the 17th to the mid 20th century, very heavy, relatively immobile siege mortars were used, of up to one metre calibre, often made of cast iron and with an outside barrel diameter many times that of the bore diameter. An early example was Roaring Meg, with a 15.5-inch (390mm) barrel diameter and firing a 220lb (100kg) hollow ball filled with gunpowder and used during the English Civil War in 1646.